Transcript Living Online Chapter 8

Unit 8
Network Fundamentals
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Describe a network
Explain the benefits of a network
Identify risks in computing
Describe the roles of clients & servers
List & describe types of networks
List & describe communications media &
hardware
Describe network security
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2 or more connected devices
Can transfer data
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Local Area Network
◦ In a small area
◦ Office, school, house
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WLAN
◦ Wireless
◦ Need Wi-Fi card
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Wide Area Network
Large geographic area
◦ Two or more LANs connected by routers
◦ Big businesses with office around country or
world
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Internet is biggest WAN
Connected by fiber, satellites, telephone
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Server manages & provides a service to client
Network OS
Username & password
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No server
◦ All PCs equal
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Small office or house
Easy to set up
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Global network of connected, smaller
networks
You connect to it through an ISP
World Wide Web & email are most popular
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Web based for internal company use
◦ Handbooks, manuals, employment forms, work
news, etc
◦ Only can access from within that company
◦ Through web browser
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Similar to Intranet
Outside users with user name & password can
have access to internal info
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Identify the type of network handout
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Teknimedia:
◦ C1.1-5
◦ C1.43-44
◦ C1.49
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Which type of network…
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Has no server & all PCs are equal?
◦ Peer to Peer
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Is a bunch of connected LANs over a large
area?
◦ WAN
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Can only be viewed within a company
network?
◦ Intranet
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Modulate-Demodulate
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Digital to analog/analog to digital
Allows data to be transmitted over a line and
changed from one signal to another
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Dial-Up Modem
◦ Internal or External
◦ Data over phone lines
 Dialed into a phone number
◦ SLOWWWWW
 Old- 300 bits per second
(bps) or baud rate
 Now- 56k or kilobits per
second
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Data over Coaxial (Coax)
cable
High speed, always on
◦ Broadband
◦ 20Mbps (Megabits per second)
& up
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Digital Subscriber Line
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High speed, always on
◦ Broadband
◦ Through phone lines
◦ 1.5-3Mbps
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Can use phone &
Internet at same time
◦ Filters on phones
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Router/Multipurpose Device
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Connects computers
Shares one Internet connection
May allows wireless access
Firewall
Wireless Adapters or NIC
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Network devices need an IP Address & MAC
Address to communicate (TCP/IP)
◦ IP: 192.168.1.120 (assigned logically)
◦ MAC: 0A-B5-74-C3-1E-FF (physically on NIC)
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DNS
◦ Translates names to IP addresses
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Which Internet connection sends high speed
broadband over analog phone lines?
◦ DSL
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If a coax cable connects to your modem,
which Internet service do you have?
◦ Cable modem or FiOS
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Every computer needs an ___ & ____ to
communicate on a network.
◦ IP address & MAC address
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The 4 LAN ports on the back of a home
router is really what device?
◦ Switch
Benefits
Risks
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Theft of services
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Theft of Information
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Hatred & vengeance
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For the thrill of it
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T or F. Hackers invade other people’s computers
only for fun.
T or F. Software sharing is one of the benefits of
networking.
When you are on a network, you should assume
that your email is not _____________?
◦ Private
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T or F. It is easier for a virus to spread on a
network.
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How is the network at school different than your
home one?
◦ How is it the same?
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Which type of network has an OS & requires a
username/password for access?
◦ Client-server
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What are two popular Internet features?
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At BK, you can access the Internet with your
laptop & no wires. What type of network is this?
◦ Email & Web
◦ WLAN
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T or F. A modem converts analog to digital
signals.
T or F. Hackers invade other people’s
computers only for fun.
A _______ is confined to a limited
geographical area.
A _______ is made up of several local area
networks.
A _______ is a simple device that connects
multiple computers together.
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ISP
◦ Internet Service Provider
◦ Pay them (Comcast, Verizon)
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Dial-Up
◦ Slow
◦ Telephone Lines
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Broadband
◦ High Speed
◦ Always On
◦ Cable, DSL, Satellite
 Cable, Phone, Dish/Air, Fiber Optics
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Wi-Fi
◦ Wireless access
◦ Public (Starbucks)
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ISDN (Old)
◦ Faster than dial-up, over phone line
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T1
◦ High speed for business (1.5Mbps)
◦ Dedicated fiber optic line
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FiOS
◦ Faster speed over fiber
◦ Comparable to Cable modem
◦ Limited areas
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Control access to computer
◦ User name, passwords
◦ If none, unauthorized people can gain access &
take/read valuable info OR change it so no one can use
it
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Passwords
◦ Change often
◦ Use upper & lowercase letters, numbers, punctuation
 Not easy stuff
◦ Don’t write them down “cheat sheet”
 Broken mostly by shared ones or cheat sheets, not guessing
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Firewall
◦ Protects against
unauthorized access to
network from outside
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Antivirus Software
◦ Always be running, updating
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Wi-Fi Protection
◦ Use the security settings
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SSID
◦ Name of wireless network
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Security-
◦ WEP: old encryption
◦ WPA/WPA2: stronger
encryption
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Passphrase
◦ To get into the wireless
network
How to
Connect to
Wireless
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Be careful who you hire
◦ People who don’t follow rules
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Back up data off-site
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Biometric security
◦ Fingerprint reader
◦ Voice pattern
◦ Retina scan
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What device allows many PC’s to share a
single, high-speed Internet connection?
◦ Router
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What are the companies called that charge
you for Internet access?
◦ ISP
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What is the slowest Internet access method?
◦ Dial-Up
Unit 8
Network Fundamentals